57 lines
1.4 KiB
C
57 lines
1.4 KiB
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_PRIME_RABIN_MILLER_TRIALS_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis
|
|
*
|
|
* LibTomMath is a library that provides multiple-precision
|
|
* integer arithmetic as well as number theoretic functionality.
|
|
*
|
|
* The library was designed directly after the MPI library by
|
|
* Michael Fromberger but has been written from scratch with
|
|
* additional optimizations in place.
|
|
*
|
|
* SPDX-License-Identifier: Unlicense
|
|
*/
|
|
|
|
|
|
static const struct {
|
|
int k, t;
|
|
} sizes[] = {
|
|
{ 80, -1 }, /* Use deterministic algorithm for size <= 80 bits */
|
|
{ 81, 39 },
|
|
{ 96, 37 },
|
|
{ 128, 32 },
|
|
{ 160, 27 },
|
|
{ 192, 21 },
|
|
{ 256, 16 },
|
|
{ 384, 10 },
|
|
{ 512, 7 },
|
|
{ 640, 6 },
|
|
{ 768, 5 },
|
|
{ 896, 4 },
|
|
{ 1024, 4 },
|
|
{ 2048, 2 },
|
|
{ 4096, 1 },
|
|
};
|
|
|
|
/* returns # of RM trials required for a given bit size and max. error of 2^(-96)*/
|
|
int mp_prime_rabin_miller_trials(int size)
|
|
{
|
|
int x;
|
|
|
|
for (x = 0; x < (int)(sizeof(sizes)/(sizeof(sizes[0]))); x++) {
|
|
if (sizes[x].k == size) {
|
|
return sizes[x].t;
|
|
} else if (sizes[x].k > size) {
|
|
return (x == 0) ? sizes[0].t : sizes[x - 1].t;
|
|
}
|
|
}
|
|
return sizes[x-1].t + 1;
|
|
}
|
|
|
|
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|